Catalina Desalination Feasibility Study 2017
Feasibility Study of Catalina Island Desalination Treatment System
Desalination System Enhancement | April 2017
Southern California Edison
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Catalina Desalination Feasibility Study 2017
AGENDA
• Review Project Purpose and Goals• Project Approach and Strategy to Achieve Project Goals
– Current (2006 – 2016 Maximum MDD) Potable Water Demand– Future (2035) Potable Water Demand– Screening of Alternatives– Evaluation of Alternatives
• Summary and Comparison of Alternatives• Conclusions and Recommendations
Catalina Desalination Feasibility Study 2017
PURPOSE AND GOALSFeasibility Study of Catalina Island Desalination Treatment System
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Catalina Desalination Feasibility Study 2017
Reliable Potable Water Source for the City of Avalon and potentially Hamilton Cove
Project Purpose and Goals
• 2000 Santa Catalina Island Census = 3,916 • 2010 Santa Catalina Island Census = 4,096
• 1980 City of Avalon Census = 2,022 • 1990 City of Avalon Census = 2,918 • 2000 City of Avalon = 3,127 • 2010 City of Avalon = 3,728
Most Feasible
Satisfactory
Acceptable
Desalination
Storage
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Catalina Desalination Feasibility Study 2017
Project Purpose and Goals
• Evaluate the Current (2006 – 2016 Maximum MDD) and Future (2035) Water Demand and Desalination Supply1.
2.
3.
• Evaluate Alternatives to Meet Demand with Desalination and Storage Capacity; Minimize Future Drought Impact on Avalon and Hamilton Cove
• Identify Recommended Alternative and Implementation Plan
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Catalina Desalination Feasibility Study 2017Catalina Desalination Feasibility Study 2017
Project Constraints, Considerations, and Assumptions
1. Stakeholder input was received for demand forecast and plan achieves 2035 Maximum Day Demand projection.
2. Coordinate approvals with required agencies having jurisdiction.
3. Allow phased approach to maintain desalination operational capacity no less than 230,000 GPD.
4. Connection of desalination distribution to Hamilton Cove is completed in conjunction.
5. Consider upgrading the existing discharge and adding a new system within the existing ocean border.
6. Desalination Facility can be operated with a higher recovery and still achieve the required water quality.
7. System’s redundancy accomplished with Middle Ranch wells and Wrigley Reservoir.
8. Pipeline from the mainland assumed not feasible.
9. Develop additional desalination supply due to drought cycles.
10. Improvements reside in exiting infrastructure or SCE-owned land.
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Catalina Desalination Feasibility Study 2017Catalina Desalination Feasibility Study 2017
Purpose – Santa Catalina Island Location
Remote Location
Residential
Tourism
Remote Location Impacts:• Extended Project Schedule• Increased Construction Cost
Santa Catalina Island Tourism:• High fluctuations of minimum
and maximum peak demand• High peaking factor
Catalina Desalination Feasibility Study 2017
Current (2006 – 2016 Maximum MDD) Potable Water DemandFeasibility Study of Catalina Island Desalination Treatment System
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Catalina Desalination Feasibility Study 2017
Current Potable Water Demand (2006 – 2016 Maximum MDD) for Avalon and Hamilton Cove
Current (2006 – 2016 Maximum MDD) Demand
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
Average Day Demand Maximum Day Demand Peak Hour Demand
GP
D
Current (2006 - 2016)
731,316
1,344,723
2,915,341
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Catalina Desalination Feasibility Study 2017Catalina Desalination Feasibility Study 2017
Current (2006 – 2016 Maximum MDD) Demand – Existing Water Facilities
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Catalina Desalination Feasibility Study 2017
Current (2006 – 2016 Maximum MDD) System – Desalination Facility
Desalination Facility
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Catalina Desalination Feasibility Study 2017
Avalon and Hamilton Cove Demand (2006 to 2016)
Current (2006 – 2016 Maximum MDD) System
0
2000000
4000000
6000000
8000000
10000000
12000000
14000000
Ava
lon
Mon
thly
Dem
and
Ave
rage
(Gal
lons
)
Peak Season
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Catalina Desalination Feasibility Study 2017
Current (2006 – 2016 Maximum MDD) System
Well No. 1
Well No. 2
Plant No. 1
Plant No. 2Storage of Baker Tanks• Storage Capacity
• Total = 375,000 GAL• Operational = 250,000 GAL• Minimum = 125,000 GAL
4-hr PHD Requirement• 489,890 GAL
Current
ADD During Max Month = 731,316 GPD MDD = 1,344,723 GPD PHD = 2,915,341 GPD
Operational Seawater Source• 576,000 GPD Operational Production
• 230,000 GPD
Brine
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Catalina Desalination Feasibility Study 2017Catalina Desalination Feasibility Study 2017
Current (2006 – 2016 Maximum MDD) System
Catalina Desalination Feasibility Study 2017
Future Potable Water DemandFeasibility Study of Catalina Island Desalination Treatment System
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Catalina Desalination Feasibility Study 2017
Future Potable Water Demand (2035) for Avalon and Hamilton Cove
Future (2035) Demand
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
Average Day Demand Maximum Day Demand Peak Hour Demand
GP
D
Current (2006-2016 Maximum MDD)
Future (2035 in GPD)
731,316
1,344,723
2,915,341
769,670
1,415,247
3,068,236
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Catalina Desalination Feasibility Study 2017
Current (2006 – 2016 Maximum MDD) System
Well No. 1
Well No. 2
Plant No. 1
Plant No. 2Storage of Baker Tanks• Storage Capacity
• Total = 375,000 GAL• Operational = 250,000 GAL• Minimum = 125,000 GAL
4-hr PHD Requirement• 489,890 GAL
Current
ADD During Max Month = 731,316 GPD MDD = 1,344,723 GPD PHD = 2,915,341 GPD
Operational Seawater Source• 576,000 GPD Operational Production
• 230,000 GPD
Brine
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Catalina Desalination Feasibility Study 2017
Current (2006 – 2016 Maximum MDD) System at Existing Desalination Facility Capacity (Deficit)
Well No. 1
Well No. 2
Plant No. 1
Plant No. 2Storage of Baker Tanks• Storage Capacity
• Total = 375,000 GAL• Operational = 250,000 GAL• Minimum = 125,000 GAL
4-hr PHD Requirement• 489,890 GAL
Current
Operational Seawater Source• 576,000 GPD
Seawater Source Deficit• 864,000 GPD
Required Seawater Source • 1,462,632 GPD
Operational Production• 230,000 GPD
Treatment Capacity with New Seawater Source• 731,316 GPD Storage Deficit
ADD During Max Month = 731,316 GPD MDD = 1,344,723 GPD PHD = 2,915,341 GPD
Desalination Treatment Deficit• 501,316 GPD
Brine
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Catalina Desalination Feasibility Study 2017
Future (2035) System
Well No. 1
Well No. 2
Plant No. 1
Plant No. 2
Seawater Source Capacity2
• 1,539,340 GPD• 2,880,000 GPD
Production Capacity2
• 769, 670 GPD• 1,440,000 GPD
Storage of Baker Tanks• Storage Capacity
• Total = 375,000 GAL• Operational = 250,000 GAL• Minimum = 125,000 GAL
4-hr PHD Requirement• 511,373 GAL
ADD During Max Month = 769,670 GPD MDD = 1,415,247 GPD PHD = 3,068,236 GPD
New Wells1
Notes:1Number of new wells dependent on alternative selected and phase2Capacity provided based on facility’s production capacity; Values may vary based on alternative and/or phase selected as a balance between treatment and storage is achieved
Operational Seawater Source• 576,000 GPD Operational Production
• 230,000 GPD
Seawater Source Deficit• 963,340 GPD• 2,304,000 GPD
Additional Storage Required2
• 1,830,000 GAL• 640,000 GAL
Desalination Treatment Deficit• 539,670 GPD• 1,210,000 GPD
Brine
Catalina Desalination Feasibility Study 2017
Development and Evaluation of AlternativesFeasibility Study of Catalina Island Desalination Treatment System
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Catalina Desalination Feasibility Study 2017
Desalination System Variables
Desalination FacilityStorage
Intake
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Catalina Desalination Feasibility Study 2017
Alternatives
INTA
KE
TRE
ATM
EN
T
STO
RA
GE
Alternatives:
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Catalina Desalination Feasibility Study 2017Catalina Desalination Feasibility Study 2017
AlternativesAlternative No. 1 Alternative No. 2 Alternative No. 3
Description 0.77 MGD Production 1.0 MGD Production 1.44. MGD Production
Feed (GPD) 1,539,340 2,016,000 2,880,000
Treatment Capacity (GPD) 769,670 1,008,000 1,440,000
Total Wells (GPD) 1,539,340 2,016,000 2,880,000
Existing Wells (GPD) 576,000 576,000 576,000
New Wells (GPD)3 963,340 1,440,000 2,304,000
STORAGE
TOTAL Added Storage (MG)7 1.83 1.41 0.64
4-hr PHD (MG) included in total added 0.51 0.51 0.51
Catalina Desalination Feasibility Study 2017
Summary and Comparison of AlternativesFeasibility Study of Catalina Island Desalination Treatment System
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Catalina Desalination Feasibility Study 2017Catalina Desalination Feasibility Study 2017
Relationship between Treatment and Storage
0 6 12 18 24
Flow
(GP
D)
Time (hours)
STORAGE REQUIRED
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Catalina Desalination Feasibility Study 2017
Alternative No. 1 – 769,670 GPD
• System Enhancements
• Source• Source Enhancement: 963,340 GPD
• Treatment• Current Operational Production: 230,000 GPD• Treatment Enhancement: 539,670 GPD• 769,670 GPD Total Treatment Capacity
• Storage• Storage Enhancement: 1.83 MG New Storage
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Catalina Desalination Feasibility Study 2017
Alternative No. 2 – 1,008,000 GPD
• System Enhancements
• Source• Source Enhancement: 1,440,000 GPD
• Treatment• Current Operational Production: 230,000 GPD• Treatment Enhancement: 778,000 GPD• 1,008,000 GPD Total Treatment Capacity
• Storage• Storage Enhancement: 1.41 MG New Storage
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Catalina Desalination Feasibility Study 2017
Alternative No. 3 – 1,440,000 GPD
• System Enhancements
• Source• Source Enhancement: 2,304,000 GPD
• Treatment• Current Operational Production: 230,000 GPD• Treatment Enhancement: 1,210,000 GPD• 1,440,000 GPD Total Treatment Capacity
• Storage• Storage Enhancement: 0.64 MG New Storage
Catalina Desalination Feasibility Study 2017
Conclusions and RecommendationsFeasibility Study of Catalina Island Desalination Treatment System
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Catalina Desalination Feasibility Study 2017
Comparative Probable Cost Estimates
Parameter Alt 1 Alt 2 Alt 3
Total Produced Treatment Capacity (Current plus Added) 769,670 GPD 1,008,000 GPD 1,440,000 GPD
Current Operational Production 230,000 GPD 230,000 GPD 230,000 GPD
Capacity Added to Existing 539,670 GPD 778,000 GPD 1,210,000 GPD
Total Wells (GPD)(New plus 2 existing) 1,539,340 2,016,000 2,880,000
New Wells (GPD) 963,340 1,440,000 2,304,000
Added Storage (MG) 1.83 1.41 0.64
Total Probable Capital Cost $19,418,000 $21,752,000 $25,734,000
Annual Probable O&M Cost $931,697 $1,135,655 $1,546,228
Total Probable Capital Cost ($ per 1000 Gal Desalinated Water Over 20 Years) $7.74 $8.68 $10.31
Total Probable Capital Cost ($ per Acre-FootDesalinated Water Over 20 Years) $2,522 $2,830 $3,360
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Catalina Desalination Feasibility Study 2017Catalina Desalination Feasibility Study 2017
Phasing Approach Schematic
Phase 5. Add treatment capacity as needed
Phase 4. Add treatment capacity as needed
Alternative 1 Phase 3. First Stage Demand Complete (Procurement and Installation of Equipment for First Stage Demand, Additional Storage, RO Equipment)
Alternative 1 Phase 2. Auxiliary System Complete (100% Construction of the Auxiliary Facilities, Building , Piping with Blind Connections for 100% Plant Capacity, CIP
System Enhancements, New Seawater Wells)
Alternative 1 Phase 1. Engineering Complete (100% Total Project Design) and 0.5 MG Storage
Catalina Desalination Feasibility Study 2017
Alternative No. 1 –Implementation Plan
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Catalina Desalination Feasibility Study 2017Catalina Desalination Feasibility Study 2017
Alternative No. 1 – Implementation Plan with 3 Phases
Alternative No. 1 –Phase 1
Alternative No. 1 –Phase 2
Alternative No. 1 –Phase 3
Description ADD EQ 0.5 MG ADD 3 Wells ADD 1.33 MD Storageand REPLACE ONE RO
Feed (GPD) 576,000 1,539,340 1,539,340
Treatment Capacity (GPD) 230,000 570,000 769,670
Total Wells (GPD) 576,000 1,539,340 1,539,340
Existing Wells (GPD) 576,000 576,000 576,000
Added New Wells (GPD) 0 963,340 963,340
STORAGE
Added Storage in Each Phase (MG) 0.5 0 1.33
TOTAL STORAGE ADDED 0.5 0.5 1.83
Catalina Desalination Feasibility Study 2017
Supplemental Slides
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Catalina Desalination Feasibility Study 2017
Evaluation of the various potential alternatives. The screening identifies applicable alternative to further evaluate
Screening of Alternatives
Criteria: Does the potential alternative address each criteria favorably
Potential Alternative
Barge Water from Mainland
Pipeline Water from
Mainland
0.54M GPD Desalination
Facility Enhancement (0.77M GPD
Total) with 1.83 MG Storage
Enhancement
0.78M GPD Desalination
Facility Enhancement
(1.0M GPD Total) with 1.41 MG Storage
Enhancement
1.2M GPD Desalination
Facility Enhancement (1.4M GPD Total) with 0.64 MG Storage
Enhancement
Project Construction Environmental and/or Archaeological/Risk/ Affects Y N Y Y Y
Water Quality Effects Y N Y Y YOperational Reliability N N Y Y YDrought Mitigation Y Y Y Y YPolitical / Public Acceptance/ Effects Y N Y Y YEngineering Feasibility Y N Y Y YProject Capital Cost N N Y Y YProject Operating Cost N N Y Y YDesign Y N Y Y YConstructability Y N Y Y YEconomic Analysis N N Y Y YEnergy Analysis N N Y Y YQualifies as an Alternative N N Y Y Y
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Catalina Desalination Feasibility Study 2017Catalina Desalination Feasibility Study 2017
Relationship between Treatment and StorageData imperative for making appropriate, cost-effective decisions
Large Treatment Capacity; Small Storage Volume
Small Treatment Capacity; Large Storage Volume
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Catalina Desalination Feasibility Study 2017
Existing Baker Tanks
125,000 gal125,000 gal 125,000 gal
• Maximum = Total Volume = 375,000 gal• Minimum = Required Volume Maintained in Baker Tanks = 125,000 gal• Operational Capacity = Maximum – Minimum = 250,000 gal
Minimum
OperationalMaximum
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Catalina Desalination Feasibility Study 2017
Avalon Demand Considerations
Current Avalon and Hamilton
Cove
Current (2006-2016 Maximum
MDD)
Future (2016-2035) Comments
Values GPD GPM GPD GPM FormulaAverage Day Demand (ADD) During Maximum Month
731,316 508 769,670 534Maximum(10 Year Historical Gallons/Month)SSO Data (2012-2016) and DPH Report Data (2006-2016)Future (Tab 4.0)
Maximum Day Demand (MDD) 1,344,723 934 1,415,247 983 ADD*PF1 Peaking
Factor1 (PF) 1.84
Average 10 Year Monthly (June-Sep) Divided by Max 10 Year Monthly (June-Sep)[Consistent with Boyle]
Peak Hour Demand (PHD) 2,915,341 2,025 3,068,236 2,131 MDD*PF2 Peaking
Factor2 (PF) 2.17 See Tab 5.0
System Requirements to Meet 4 Hour PHD (Gallons)
485,890 511,373
Minimum Day Demand (Gallons) 143,148 99 Unknown
Minimum day demand is lowest demand (Avalon only) between 6/1-11/1/16. Date of low demand was 10/27/16. Things to consider: this occurred when 40% conservation efforts were in effect, SCE may be flexible to meet the operating limit of standard equipment (i.e. if 100 GPM), consider the source production limits (if we only are able to operate one sea well, the typical flow rate is 200 GPM/well).
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Catalina Desalination Feasibility Study 2017
Detailed Probable Cost EstimatesItem
Equipment Description Alt 1 Alt 2 Alt 3
1 New RO Skids $540,000 $1,080,000 $2,250,0002 Energy Recovery Devices $30,000 $60,000 $120,0003 Space Chemical Metering Pumps $3,000 $5,000 $10,0004 Spare Product Water Pumps $9,500 $19,000 $38,0005 Piping on RO Skids $5,000 $10,000 $20,0006 Intake Wells $1,500,000 $2,500,000 $4,000,0007 Storage Volume1 $3,660,000 $2,820,000 $1,280,0008 Re-clad Existing Structure $223,000 $223,000 $223,0009 Engineering (10% of Capital Cost) $686,608 $769,110 $909,870
10 Electrical and Instrumentation (15% of Capital Cost) $895,575 $974,100 $1,157,70011 Permitting (5% of Capital Cost) $343,304 $384,555 $454,93512 Oversight & Project Management (5% of Capital Cost) $343,304 $384,555 $454,93513 Grant Compliance / Administrative Support (2% of Capital Cost) $137,322 $153,822 $181,97414 Sampling & Testing (2% of Capital Cost) $137,322 $153,822 $181,97415 Utilities (2% of Capital Cost) $137,322 $153,822 $181,97416 Construction (15% of Capital Cost) $1,029,911 $1,153,665 $1,364,80517 Commissioning (2% of Capital Cost) $137,322 $153,822 $181,974
Alternative Improvements $9,818,487 $10,998,273 $13,011,141Taxes (10.25%) $1,007,000 $1,128,000 $1,334,000Material Mark-up for Transportation to Catalina Island (10%) $982,000 $1,100,000 $1,302,000Contractor Mobilization and Overhead and Profit (6% + 15%) $2,062,000 $2,310,000 $2,733,000Project Subtotal $13,869,487 $15,536,273 $18,380,141Contingency (40%) $5,548,000 $6,215,000 $7,353,000Total Probable Cost (Rounded) $19,418,000 $21,752,000 $25,734,000Annual Probable O&M Costs (Per Year) – 20% $931,697 $1,135,655 $1,546,228Total Probable Capital Cost ($ per 1000 Gal Desalinated Water Over 20 Years) $7.74 $8.68 $10.31Total Probable Capital Cost ($ per Acre-Foot Desalinated Water Over 20 Years) $2,522 $2,830 $3,3601Storage volume includes Operational Storage, Equalizing Storage, and Standby Storage.
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Catalina Desalination Feasibility Study 2017
Modify Existing Structure (A) or Construct a New Facility (B)
New Structure vs. Existing Structure
A
B
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Catalina Desalination Feasibility Study 2017
DESALINATION FACILITY – PLANT NO. 1
Phasing
50,400 GPD
50,400 GPD
50,400 GPD
50,400 GPD
288,000 GPD
288,000 GPD
288,000 GPD
288,000 GPD